What I've learned through the years on being on forums is that many people *DO* care, just not everyone is good at expressing it in a friendly manner. I mean, does every single post need smilies to come across as friendly? Some people are just better at handing out the honey instead of the vinegar.
Myself, personally? I just piss people off without even trying to... lol Even when it's over the *SAFETY* of the animals! Provide facts and information that isn't even rude in nature, and people still get pissed, block/ignore me and leave. That kind of reaction though does spark a nerve, and hopefully, with any luck, that person is more willing to do research once they've calmed down.
For me at least, the last thing I want to say to someone is "I told you so", but I have had people tell me I was right. Some people thought I was crazy in my suggestions but what I suggested worked?!?!?!?!
I come from a different hobby background though. I could, for the most part, care less about fish! They just don't tickle my fancy! Sure, I like looking at them, but that doesn't make me want to keep them. They are just not my forte. The hobby that I do come from though has some of the same issues as fish keeping does! Too small of enclosures, inadequate diets, an unhealthy environment (be it bad water, or bad air!), and so many more issues!
(in regards to fish)
In most circumstances, I feel as if a 10 gallon is the smallest that most people should go, even for tiny shrimp. My boss has a female betta in a 3 gallon. She did do some research at least, as the betta has a heater and a filter. I managed to snag a somewhat larger tank (sold as a 3 gallon, seems closer to a 5.5 gallon, but one in store that looks exactly the same being sold as a 6.6 gallon tank?) and that may become the female bettas new home. Although not a 10, still better than a 3! Just gotta convince her to get live plants for the new tank. The 3g did have live plants, but then they were switched out for fake ones and trying to get her to go back to live ones. (boss doesn't quite understand the importance of plants and how they are better than fake... but she's willing to learn!)
When people are passionate about a subject, things do tend to get heated, unfortunately. Still, a lot could be learned from a good debate from opposite fractions that may not be learned otherwise.